Do not look up in prayer

A severe warning against raising the eyes to the sky while praying.

Narrated by Anas ibn Malik

What is wrong with people who raise their eyes to the sky in their prayer? They must stop, or their sight will be snatched away.

Sahih al-Bukhari 750

What this hadith teaches

Keeping the eyes on the place of prostration helps the heart stay present.

Reference and grade

Grade
Sahih (in Sahih al-Bukhari)
Narrator
Anas ibn Malik

The hadith in Arabic نص الحديث

مَا بَالُ أَقْوَامٍ يَرْفَعُونَ أَبْصَارَهُمْ إِلَى السَّمَاءِ فِي صَلاَتِهِمْ ‏"‏‏.‏ فَاشْتَدَّ قَوْلُهُ فِي ذَلِكَ حَتَّى قَالَ ‏"‏ لَيَنْتَهُنَّ عَنْ ذَلِكَ أَوْ لَتُخْطَفَنَّ أَبْصَارُهُمْ

Arabic text of Sahih al-Bukhari 750, as given on sunnah.com.